Power supply system

Abstract

A power supply system includes a solar power generator, a storage, a controller, a calculator calculating a predicted amount of electricity consumed and a predicted amount of electricity generated, a calculator calculating a shortage amount that is a difference between the predicted amount of electricity consumed and the predicted amount of electricity generated, and a device setting a predicted amount of electricity stored. In a specified time in which electricity cost is lower than in other times, the controller controls such that the storage is supplied with electricity supplied to a building until an amount of electricity stored reaches the predicted amount of electricity stored. In the other times when an amount of solar power generation is larger than an amount of electricity consumed by an electric load, the controller controls such that the storage stores a surplus of the solar electricity.

What is claimed is: 
     
       1. A power supply system configured to be capable of feeding supply electric power, which is supplied to a building including a wiring and an electric load connected to the wiring by a power system of a power supplier based on a power supply contract, into the electric load, the power supply system comprising:
 a solar power generating device configured to generate solar electric power by solar light; 
 an electricity storing device connected to the wiring and configured to be capable of storing solar electric power generated by the solar power generating device and supply electric power supplied by the power system and to be capable of discharging the stored electric power into the wiring; 
 a consumption controlling means for controlling consumption of supply electric power supplied by the power system and for controlling consumption of solar electric power through consumption by storage in the electricity storing device and through consumption by the electric load; 
 a predicted amount calculating means for calculating a predicted amount of electric power used on a following day by the electric load based on a use record of the electric load, and a predicted amount of electric power generated on the following day by the solar power generating device based on a weather prediction; 
 a shortage amount calculating means for calculating a shortage amount of electric power, which is a difference between the predicted amount of electric power used and the predicted amount of electric power generated, when the predicted amount of electric power used is larger than the predicted amount of electric power generated; and 
 a storage amount setting means for setting the shortage amount at a predicted storage amount, which is an amount of electric power stored by the electricity storing device after completion of storage of electric power by the electricity storing device, when a limit storage amount, which is an upper limit amount of electric power stored by the electricity storing device, is equal to or higher than the shortage amount, and for setting the limit storage amount at the predicted storage amount when the limit storage amount is smaller than the shortage amount, wherein:
 in a specified time slot determined based on the power supply contract, during which cost of electric power is lower than in other time slots than the specified time slot, the consumption controlling means carries out control such that the electricity storing device stores supply electric power until an amount of electric power stored by the electricity storing device reaches the predicted storage amount; and 
 in the other time slots, when an amount of solar electric power generated is larger than an amount of electric power consumed by the electric load, the consumption controlling means carries out control such that the electricity storing device stores a surplus of solar electric power. 
 
 
     
     
       2. The power supply system according to  claim 1 , further comprising a charging/discharging device that includes a connection terminal part connected to a vehicle, the charging/discharging device being configured to be capable of supplying supply electric power to the vehicle through the connection terminal part, thereby charging an in-vehicle electricity storing unit mounted in the vehicle with supply electric power, and to be capable of discharging the electric power of the in-vehicle electricity storing unit, which is outputted from the vehicle to the connection terminal part, into the wiring, wherein the consumption controlling means carries out control such that the electric power of the in-vehicle electricity storing unit is discharged into the wiring when a sum of the amount of solar electric power generated and the amount of electric power stored by the electricity storing device is smaller than the amount of electric power consumed by the electric load. 
     
     
       3. The power supply system according to  claim 2 , further comprising:
 a storage means for storing a cumulative total value of an amount of electric power discharged into the wiring from the in-vehicle electricity storing unit; and 
 a cumulative total value calculating means for subtracting an amount of electric power, with which the in-vehicle electricity storing unit is charged, from the cumulative total value stored by the storage means every time the in-vehicle electricity storing unit is charged, and for carrying out control such that the cumulative total value after the subtraction is stored in the storage means, wherein in the other time slots, the consumption controlling means charges the in-vehicle electricity storing unit with the surplus of solar electric power in priority to storage of the electricity storing device when the amount of solar electric power generated is larger than the amount of electric power consumed by the electric load and the cumulative total value after the subtraction is larger than 0 (zero). 
 
     
     
       4. The power supply system according to  claim 1 , further comprising an energy conserving device activated by electric power supplied thereto to store energy, wherein in the other time slots, the consumption controlling means activates the energy conserving device by the surplus of solar electric power when the amount of solar electric power generated is larger than the amount of electric power consumed by the electric load and the amount of electric power stored by the electricity storing device is equal to or larger than a predetermined set amount. 
     
     
       5. The power supply system according to  claim 4 , wherein:
 the energy conserving device is a heat storing device having a heat pump unit; and 
 the heat storing device activates the heat pump unit by electric power supplied to the heat storing device and stores an amount of heat as the energy.